
interface Radio {
  switchRadio(trigger:boolean):void;
}

interface Battery{
  checkBatteryStatus():void;
}

interface RadioWithBattery extends Radio{
  checkBatteryStatus():void;
}

class Car implements Radio{
  switchRadio(trigger:boolean){
    
  }
}

class Cellphone implements RadioWithBattery{
  switchRadio(trigger:boolean){

  }
  checkBatteryStatus(){
    
  }
}